Safety air valve



c. s. oLsQN SAFETY AIR VALVE Carl 5. Olson lllllIIllllAIAl/l ATTORN EY Patented July 27, 1926.

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\ sArn'rY .are VALVE.

Application filed. August 22, 1924. Serial No. 733,640.

My present invention .has reference to a safety air valve which is used in connection with the air conductor hose 'for inliating pneumatic tires, and has for its primary object to produce a device oit this character which can be set at a ydesired pounds .pressure, and aiiter the desired amount ot air has entered the casing, surplus air will be permitted to escape to the atmosphere d further object is to produce a. device oit .this character including two casings having a ported connection therebetween, one oi the casings having an air inlet passage to which the air conducting hose is connected, and arranged in a line with the said passage there is a valve which is spring seated and which has a hollow stem, apertured at its connection with the valve, said casing having an open end in which is seated a. compressible ring designed, when forced over the tire valve to unieat the valve in the said casing to permit ot the air flowing` into the tire, while the other casing has adjustably arranged therein a spring seated valve, and adjustable means for seating the valve also regulating the amount of air pressure which will unseat the valve, and the unseating ot the last mentioned valve permitting air to escape to the atmosphere and whereby only a desired and detern'iined amount o1E air will be admitted. into the tire tube.

The foregoing, and other objects which will appear as the nature ot the invention is better understood, may be accomplished by a construction, combination and opere-.tive association ot parts such as is disclosed by the drawings which accompany and which form part ot this application.

ln the drawings y The ligure illustrates an approximately central vertical longitudinal sec-tional view tlnough the improvement.

Referring now to the drawings in detail, the nui'ncrals 1 and 2 designate two cylinders arranged side by side and connccted together in any suitable or' desired manner. Between the cylinders there is an air port l. VJlach ot the cylinders preferably has its ends open, and the cylinder 1 is integrally termed with a conical pipe extension l through the bore ot which air is admitted into the said cylinder. The pipe extension is designed to be connected with the usual air conducting hose.

ln this cylinder, below the bore of the air inlet pipe 4 there is a valve seat 5.

Resting on the seat and normally closing the passage thereto is a valve 6. The valve is 4p:rovided with a stem 7 that is guided through the valve seat.

Screwed in one `end ot the .cylinder 1 is a cap nut 9 that has its inner wall cent-rally Soi-med with a depression forming a seat for spring 10, the said spring contact-ing with the valve 6, normally holding the same seated. Screwed in the opposite end of the cylinder 1, .there is a flanged cap 11. Held in Contact with the lower wall of the cylinder by the tianged cap 11 is a compressible ring 12. rlhe ring has its inner face formed with a rib 18 that surrounds the opening therein, and the said rib is arranged opposite the lower end ot the hollow stem 7.

ri`he lower open end of the cylinder 2 is closed by a cap nut 14C. The cylinder, at a suitable distance' below the port B is provided with valve seat 15, and on this seat there rests the conical end ot a valve 16. The valve has a. stem 17 which is graduated, as at 18. Screwed on the upper end of the cylinder 3 there is a sleeve 19. The sleeve has a closed top 20 provided with a central aperture through which the valve stem 17 passes, and in addition thereto is provided with any desired number ot' apertures 21. Contacting with the ianged top of the sleeve 19 and with the top oi. the valve 1G, and surrounding the valve stem 17, there is a helical spring Q2.

in operation, the sleeve 19 is screwed until the desired scale mark 1S which indicates the amount of pounds pressure of air to be let into a tire, is in a line with the top of the said tube. he cylinder is then brought over the valve of the tire tube, and the said valve contacting with the compressible ring 12 will torce the rib 13 thereof against the lower end oit the valve stem 7, unseating the valve (l, against the pressure ot its spring 10. The air is then admitted through the inlet. port provided in the pipe extension Il, and when the tire is intlated to a desired degree, surplus air will pass through the port 8 trom the cylinder 1 into the cylinder 2 to force the valve 16 away from its seat against the pressure of its spring 22, permitting such air to find an outlet through the apertures 21 in the top 20 of the sleeve 19, it being understood that the valve stein T is loosely received through the valve seat 5.

rllhe stem 7 of the valve 6 has transverse ports 6 and 7 which communicate with the central port 8. The port 6 is located a slight distance from the valve, and the port 7 is positioned So that the same Will at all times be arranged in the chamber in which the arched compressible ring 12 is seated.

Having described the invention, I claim ln a device for the purpose set forth, an open casing having an intermediate partition therein dividing the same into an upper and lower compartment, and said casing having pipe extensions whose. bores communicate with the respective compartments, said partition being centrally formed with an opening, a valve seat on the partition surround ing the opening and extending` into the upper compartment, a flat valve having a compressible facing for the valve seat, a stem ttor the valve extending in opposite directions therefrom, one of said extensions pass ing through the mentioned opening in the partition and being provided with a central longitudinal opening and with spaced transverse ports which communicate with the opening, one of said ports being disposed on the stem close to the valve seat, a spring surrounding the upwardly projecting end of the stem, a cap member screwed in the up` per compartment and having a central opening` to receive the spring therein, a lianged ring for closing the lower compartment, and a centrally ported compressible element engaged by the ring and forced thereby into Contact with the lower wall or the casing, Iand the opening in the said element being disposed to receive therein the lower end of the valve stem.

In testimony whereof I alii): my signature.

CARL S. OLSON. 

